呋喃及其衍生物低压热解产物鉴定和质谱分析

摘要

利用同步辐射真空紫外光电离质谱方法鉴定了呋喃、2-甲基呋喃和2，5-二甲基呋喃的低压流动反应器热解产物的分子结构。基于质谱信号强度和生成温度，比较了每种燃料的主要初始分解产物的异同。通过不同温度下的质谱测量结果对3种燃料的初始分解路径进行了分析，发现呋喃、2-甲基呋喃和2，5-二甲基呋喃的最重要的初始分解路径是通过卡宾中间体分别生成CO＋丙炔，CO＋1-丁炔和CH3CO＋C4H5，从而验证了前人理论研究成果。%The pyrolysis products of furan,2-methylfuran(2,MF)and 2,5-dimethylfuran(DMF)in flow reactor at low pressure were detected by synchrotron vacuum ultraviolet photoionization mass spectrometry(SVUV-PIMS). Regarding the signal intensities and formation temperatures,the major primary decomposition products of three fuels were compared. Mass spectrometric analysis was performed to provide experimental evidence for discussion of pri-mary decomposition pathways of the three fuels. The dominant primary decomposition pathways of furan,2,MF and DMF pyrolysis are concluded to be the carbenic rearrangement to produce CO+propyne,CO+1-butyne and acetyl+C4,H5,respectively,verifying previous theoretical results.